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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3c2c93880c7f348ffa55ea788ff7b478fc689ceddcfcb736c02e21b02e42fd2' 
  AND token = '7l2efAFuk0JkjQjO2a2HC5kSyU9t3xDEyKgfPqZL9jQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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