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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd05eedfa028a03f11bbea5b7f7de3ed2c45ff85ed9d6b19fa26a0b27f490fc0e' 
  AND token = '6/vWZ8oDx+sURaEGcJsEZn6dv6zFFPGk069j+ieaYAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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