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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '696459d114b8ed7a74771a7031744ab2d8c9f9b485acea78daeeadac62472ea5' 
  AND token = 'zDC9jevSl9b6Mkd1WBYaPILoJEGh22TTNiILBchoVs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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