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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82e048d2b00bb754d16830b5fbbf224f32667de6495f515282b10a41d0d3db7b' 
  AND token = 'CawT+kdEyTMLWX120RJRPup6gE5fwTlBO8trhseadTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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