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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '238841b4c202a6e38ba72a4462fc6054ba495fffc31ada1d01597f706f1a5f04' 
  AND token = 'eyOx7LmeBFpA/kA79AbFCK5VpWbazZwhMonXTk5oX64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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