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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79d4e6023fa6181be5a1e68c67265b14743749c6de9a0f10053edc578e101028' 
  AND token = 'mUj/u1p/Ccur2H0mwNOJzuUfeNwll7mUpN9OyeBEfKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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