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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5110fb9b9db730e01c397a88cdaa1d7c4a2d44af4ba0b087adb7b7384c3d8abe' 
  AND token = 'LZOk0OEEnwBZt6M5RGnidAUyuWm1Fpq5cRDMkwbV2HY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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