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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d2d8429778f714d0a03e209ab0b282cdbd6e9daf71d43be8fd703ea4d6c9a11' 
  AND token = 'Lok3qWQdG2J5mBZ2SxaPIxtJnMjO+Zk7FOvz2yL5Bqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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