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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a711df243c966dfe4fac3a74279cfc9863c9aac0687979733f194ca603823ba' 
  AND token = 'TXAIwAFZlzosmmKa6jozLoffRLWzIjAN/s9YPkZ7Yyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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