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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aee159a022b45a58af26fdc4a4af71ecf806dc175c94354ce1f257a744cd0620' 
  AND token = '1soXNGZSFoliK6jvFJW5VeiruZZVLjSrO8PBvZ7GbEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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