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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '983995207bea24750a9acccc610541779dda0a04db3dbc2e935a67e2399d0560' 
  AND token = 'HtHc9VVBTBM4/KA29vK1aaHWWGUiGp5VKmUbtp3U8ZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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