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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4fe1a25c6db3ccaedd034d8b4a9f06ce92d0f98351fb0464466a283072bc16d' 
  AND token = 'KxQyBoKqRdZOIWxeggadoR+fa/J+UEwLpmagaWtLDZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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