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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0718069961f53720cbe9d8702d88c8c9b85b57ffb74d4c80adbdfb3a0d9bf596' 
  AND token = 'zf41Fja2mpDuK853d/L0elQu9L9XEywu1TIubIETUCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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