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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae51ed353bea6ba23a79ba26982e46d744be759636539082265cdb19501114fa' 
  AND token = 'bIfJZ5P67ICAqJScWJ19nfJz6NKLByIn9VOkfDIjANk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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