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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef0bba3ef7e1e89cc6ce3f69df9b3ee77ac8ca6b37cbf66abafeeb661c1347fa' 
  AND token = 'g3Y3cG1DrkH4E7ZWDcXih6Kyql8u/dZJ31CNQGKapJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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