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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bf1a55687d7c0a4c37fd71f7cc50626a2f15a1d1d26e6a7d59c2443c04d0ded' 
  AND token = 'mzktyeCb63YL94NWJc2jDjeCzgU1ttn5YZvh39s2Ack=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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