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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3fe1f288d8dc1e3e22752a7a5cb2ad3fd296049f6d2fd2b25a7b4fdfe9f45b3' 
  AND token = 'XZvwwuUS11z2np4BlHu1dV2t3Yiif3o/VFyH6LWKA/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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