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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1486b0bab0f60e91e8f713da2ac8d99840365675a885267ba385158f58859630' 
  AND token = 's7KWzs0jB/nTQLKeeVNHcXnN/O27FSTBM92EY1J7dPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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