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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3422ac0fbe153a1bc40d35caf9fd08dd317408f89ed890ad89f53fde847f774' 
  AND token = 'wg4Si9ItbmSIUPuj3in18lnXa0NX6e1Zp051piS8vfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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