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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3908658136c6bfe19be53c463bf1b94be086111e927a91bf043a49e73a5a77eb' 
  AND token = 'okGx9Hn/qg5kuqc71vO4CIcszstN4Jshqc5FrQ7Wmbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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