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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0df780131749339157c9b7080a8e9dd90558f9ff1ef7ab363c4cfe9e0f94ec2' 
  AND token = '9Ss4n+PKy2d01EgBHT0Qc2GsV9dJ1BglTwdQ1QwvGbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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