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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ebde57b10e0cf13e3ef549b947d2cc7ffb5117d172c1f7a5dc9530e777343d4' 
  AND token = 'vGl9qoqJHVdU2XqI+VZGFg6RqA9Cp8NIFI0klHZr+VI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}