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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac362bab8dea899067c32993948a6300f0f551f367f2b89316b8724184659203' 
  AND token = '4+K6Se9Th2tFrlFWn9Cv507bqHkjFoY/zr81Ce5/JR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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