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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '013276965762e6ac9ecc779e8d64ce5dfe5bf070dce62a121c113e8aaaa2c6c5' 
  AND token = '5cI5i3l+G4LXABwwgXn2cCPPafGWZ4iggtAIZqG7Qwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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