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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3078097ac8b8038065591ba87d45896a19886622d0b76a949fb8616f4c1fd20a' 
  AND token = 'W4GZz5MmH89Uu1Yzb3jlZJsxPZ4dMmK7vlQmMHhiHE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00091

JSON explain

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