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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd316f8b778ca2aff381cc11d9d71166102443558f95ca0234b5f5a0fd4183258' 
  AND token = 'sB1JbZ+2cFli8T4fzNvbnrYLyYQZ86GusK82y/DRN20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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