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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf6717bc83bfcb516db7375e4994fdb9e5f616c9c02b0d697d3e7af1eea35cde' 
  AND token = 'yFnP35sZ3xU5kKUNjO3/eXmzTB6lzlUM/F+FgejSf+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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