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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f45cf7c2c598eafcbedd293e768ef7937ee8f3b31e4332e61d9fdc3c134a6bfd' 
  AND token = 'E/S9C4CQgxT3baflZ0zjM0HDql6krhW0CNDQnrAAeXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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