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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47c400caaf85d8557c2a6fcc9e40693b0ca5d49f16a47c09bb536d1ed0b0a06b' 
  AND token = 'Ncat5Nn4HfuFjXwlu/oixoVin5G5OxPg7HkKeVwzTh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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