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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0879752065606d8b36d43a29cfd4c477c0c07c5c7b24f4600de04e9046adedc7' 
  AND token = 'enqzoa6t2jv2vAZY1jZpat+Np4i2SAqMLntC4BddomE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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