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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24fae21073acb421401fa1b1f207428b2d6f5c18523256fc48d8c0864b87f825' 
  AND token = 'NgER4PeXgyt3C8GQHds73VrIDbTYp4hDbCJtJxjD8Ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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