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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68cc7b25850fac3e867200ade59961d998e483fbd4159cffef56f6d2350184bf' 
  AND token = 'HZ8dcySKQNRypZPIN7JRnIBPFhzwmLdilbw0/y8ti8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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