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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8314fab6736a2051bab927179896f47d15c8d792907e2e34acbe8b303af47e77' 
  AND token = '7Y3jq3SHpLjXwf5xF5HW8155oMKxrWxydgoAhqfrKEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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