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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb57fcfbb33c3b33c6b93f1a6440db8a3f5b505d9b355fa3682a932f49c4bf3d' 
  AND token = '8AEW6DUoE2LkPBBB2NqMJjLqAPPml9LXRJnoq1Y1jng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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