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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b698a5ae41a2c2e764c597d4b9b8cc1de37bdbd821854aadf46b054b4df86ed6' 
  AND token = 'ENzoOESPBCoasHiiTiqGjEwR+st7WEIhQc8rnCg9Z9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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