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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28c3dfc8a64d726e287ec73b69f21f9ea09b2ea7d83cdedab988f9f510b5a124' 
  AND token = 'Eon8nJhiq5rMMZk/Fuf5APlSXmO240oQyLmvMpZfb4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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