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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b33968e790098bdab9f37a0b5b3a570ab2eabde04ae8b0f57b1c9c4f10ca30c9' 
  AND token = 'IBH24Sg53ET0/UX90HPvLNNbPnAAcitHuaqz55rr2Cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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