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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec4a6c7999ed2bafefb500f68efb2e620e93fc1e320c7e1ddf6a829eff8c41ca' 
  AND token = 'aEACF3Bsv4fMSDBVuqWNTbf7yuqpQzydeBal2+dwAW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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