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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23aa9adf58ef5555f112319d981f24a474c64d561f4f2d8756d1fe8fb7064a05' 
  AND token = '0mMPDE1bD3H+hTSFXfS8Xg8W0opq9XHGr+kMC4TyhOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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