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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '379af87c2472245799dc32374060e7c558cea04b899bc89d595c214b001daecf' 
  AND token = 'HzDbJ8RuhoIO94/jmiKJ8A3TgVyT0GPV4Fe7suxkTUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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