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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd37998a599ab59d8092acf49a6a3a9e6a688970d2fa298374c5d9cc99b8059f6' 
  AND token = 'dT+Ezlmrm4GPes4fmKdN5yJi5NISbuyiqwkTsF6GTFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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