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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '576409ed40464e1ff95e85c49e7c7645fcb626033ccad912487823bdb383988f' 
  AND token = 'vH2vxgEsii1hdgcybxXCVwKTqpgbLWx6YfEe8ztFWfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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