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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a658711dfa5f223b0f7ae8f02b2a34b85d29a8d227b5c7ae6190a7322fbda0a' 
  AND token = 'unAdPLDB/8mb6lfclAimHr9/MZfguo/FDfZlhiqdBKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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