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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79241806b49e0b05016f95a2f1987a5c136a1f968e3f52795918f47ed90e8741' 
  AND token = 'YkonyPdcsM3TCVOWfnkp9iMqfOGTJn88Rt1o/IYkasI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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