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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0212c6ea5f71db03b6f5cc1ae1e859b3b2bad9aa76848b8f50089b3168df04e6' 
  AND token = '6Bsa8NYXlDABGwkILVoNBvqqtjNwLdDEIlU3uP6me7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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