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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80915fdae7c9eee9492b226cd1ae3ed7a6ed6f444da882f1f42e2a26059a62ba' 
  AND token = 'qe9wgclXHEMclb8fLDcmn+6Net7bP36lUamW7nr8dEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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