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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f873bd4aff6d508845823ccff415181782cae7734d88f32d9af7d074d8eea3e' 
  AND token = '5ZBKDyb8uk8JC/gvqcmhvNAGaf31T+i1w2xX+F7HSpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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