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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '355cdf2b12a270454b03f0be91ce2d833d0b1f1755671d6720fd45b722f3329b' 
  AND token = 'ldRlcSXCeaqenWxFnZNNxQT3Jw13sWAhFdDnUTiCrx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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