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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1861b962b1b405ad897d6e2b681c493c8ee76e0560e72df90dfea02723784228' 
  AND token = 'FSrYyRbMD3tlWpm5lub4G2jk0+K88eKL7EdXsXfp4ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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