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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcbc8620fac4500809ea32d6e0c807101acaf5e56325f24b487c2c2acc17ce6a' 
  AND token = 'tJmiCKwrttL4jzV84y9wgHzrKvRIYDDFwMXkir125Vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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