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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddce907f3de0015c0e22ad7512609fe578a1d6fca4cfff56de28777c97fa0bb9' 
  AND token = '9gwFFMCtQ8/6P33o1nOx1GDoxDXgLZwgUZFhG2Mk+dU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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