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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d784569c84c973fe0823bd4251953518d71a10109dde7f6097adad4000d9a0c' 
  AND token = '8qOoUeNnbfxYqakxtP0iWsnbrw+yQK5Xvl6HkLocQcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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