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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f77459be147cc200e25843f94b044978131c8d087dad9dd5e24e53fd6017c209' 
  AND token = 'fCgG1gmj16f/ts9xLABez4JhGZ/k2Ftc6qBh04yfltQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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