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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b29e5a5bb3bd23daf542498b0dce85c2028be686a0b49d35dd6cc949ae50ced3' 
  AND token = '0QJzA1S71jCR0sv/xM231wvM0v4uCPjha2NQ+P6X3H8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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