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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95f480c3889082bdb2834cf83bad8c15a865be4f0a7d021c149242799e9abe51' 
  AND token = 'dhNm+kp18/B95Xto2EcfnZ9hJuA+0C+qAUfW5lwdflc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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