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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f04c83b8fc8fc38dacffc1ebd532d8fa656a800a92fbc3ab4af5ce5083f97f9' 
  AND token = 'Oo1BJsWKa/zpMlDM5yM9kbfx1VNCwBd+n0t8Q+400cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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